1. Identify the color by touchstone. The fineness of gold jewelry is determined by comparing the colors of gold and the measured jewelry. The method should be carried out under natural light and fluorescent lamps, not under direct sunlight and incandescent lamps.

2. Grind and identify jewelry and gold on the touchstone with acid spots respectively, and test nitric acid on the golden path with a glass rod. Because the chemical property of gold element is stable and does not react with acid, its color remains unchanged.

3. Burn the jewelry to be identified (don't make it melt and deform), and observe the color change after cooling. If the surface is still golden, it is pure gold; If the color darkens or turns black to varying degrees, it is not pure gold. Generally, the lower the fineness, the thicker the color, and all of them turn black, indicating that they are fake gold ornaments. When it really burns red, it is quenched into water and its color remains unchanged. It really doesn't change color in case of fire, it doesn't resist fire, and it becomes dark purple.

Because gold has a high collection value in past dynasties, fake gold has appeared in various historical periods, and it is difficult to identify the authenticity of Qianlong gold. To distinguish authenticity, we must start with the shape, texture, patina, handwriting and manufacturing technology of gold. The casting process in different historical periods is not the same, so counterfeiters can't fully grasp it. The value of coins depends on their age and the number of coins left. Coins not only have economic value, but also have historical value and artistic value, which directly affects economic value.

First, the main use of gold

(1) is used as international reserve. This is determined by the property of gold as a monetary commodity. Because of its excellent characteristics, gold has always served as a functions of money in history, such as a measure of value, a means of circulation, a means of storage, a means of payment and a world currency. With the development of social economy, gold has withdrawn from the circulation field.

(2) Used as jewelry decoration. Gorgeous gold ornaments have always been a symbol of one's social status and wealth.

(3) Application in industry and science and technology. Because gold has unique and perfect characteristics, it has so many beneficial attributes that it has reason to be widely used in the most needed modern high-tech industries.

Second, the role of gold in the monetary system can be traced back to the1618th century, which was widely adopted by emerging capitalist countries. The multi-standard system is divided into two forms. One is the "parallel standard system" in which gold and silver are circulated according to their actual values. For example, in Britain, gold coins "guineas" and silver coins "shillings" are circulated at the same time at market parity; The other is the "dual standard system" or "dual currency system" in which two currencies circulate at the national legal parity, which is also commonly known as the "multiple standard system".